Material Specification for Aviation Fuel Piping - CR4Sep 17, 2008Re: Material Specification for Aviation Fuel Piping 9:32 AM Good morning denis, you don't say wether you're talking about ug or above ground piping, but in either case, I would suggest regardless of your decision to use either metal or plastic, when working on it, after it has had flammable fuel in it, to always ground it with wet[PDF]**********************************************************UNIFIED FACILITIES GUIDE SPECIFICATIONS References are in agreement with UMRL dated July 2019 ***** SECTION 33 52 43 AVIATION FUEL PIPING 08/18 ***** NOTE: This guide specification covers the requirements for piping and valves for aircraft refueling systems constructed to the requirements of the DoD Type III/IV/V, and Cut and Cover Hydrant